.key_white, .key_black {
    position:     fixed;
    width:        40;
    border-style: solid;
    border-width: 1;
    vertical-align: bottom;
}

.key_white {
    top:              100;
    height:           170;
    color:            #000;
    background-color: #FFF;
}

.key_black {
    top:              100;
    height:           100;
    color:            #FFF;
    background-color: #000;
}
